How Can I Access the Style Properties of CSS Pseudo-elements (:before, :after) using jQuery or JavaScript?

Accessing Style Properties of Pseudo-Elements with jQuery

Pseudo-elements like :before and :after are used to add decorative content to an element. While they can be visually inspected, accessing their style properties directly with jQuery can be challenging.

Unlike normal elements, pseudo-elements do not exist in the DOM and cannot be selected using standard selectors. This is because their purpose is to modify the appearance of their associated elements, rather than to provide independent content.

In the given scenario, you are trying to detect pseudo-elements that have default background positions. Using $(".commentarea .author:before") will not work because :before is not a valid jQuery selector.

Instead, you can try to extract the original CSS rule using the jQuery plugin mentioned in the answer: http://flesler.blogspot.com/2007/11/jqueryrule.html. This plugin allows you to parse CSS rules and access their properties.

Alternatively, you could use JavaScript to access the computed style of the element, which includes the effects of any pseudo-elements:

const computedStyle = window.getComputedStyle(element);
const backgroundImage = computedStyle.backgroundImage;
const backgroundPosition = computedStyle.backgroundPosition;

This approach allows you to obtain the style properties of the element as seen by the browser, including any modifications made by pseudo-elements. However, it is important to note that the computed style may not always reflect the actual source CSS rule, especially in cases of complex cascading.

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